Derby dell'Elefante in official championships

"Derby dell'Elefante" means Elephant derbies, the matches between the most
important teams of Catania, in Sicily, Italy. The matches in regional leagues
are not considered. First Derby dell'Elefante was played between Catanese and
Virtus after World War II. Then, this two teams melted in Catania Calcio, that
played his first derby in official championships in 1999, against Atletico
Catania.